Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals
Patent
1995-11-03
1997-07-29
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Combining of plural signals
327356, 327363, 327553, G06F 744, H03B 100
Patent
active
056525370
ABSTRACT:
An impedance multiplier circuit comprises an input impedance having a certain value of impedance and a circuit coupled to this input impedance for multiplying its value by a multiplication factor. This multiplying circuit comprises a first and a second voltage follower amplifier and a first and a second scaling impedance. The input impedance is coupled between the input of the first voltage follower amplifier and the output of the second voltage follower amplifier with the first and second scaling impedances establishing a voltage division between the output of the first voltage follower amplifier and the input of the second voltage follower amplifier. In this way, the second voltage follower amplifier provides active negative feedback, and effectively multiplies the input impedances's impedance by a factor of one plus the quotient of the second scaling impedance to the first scaling impedance. In this way, the impedance multiplier allows the use of small value, highly accurate resistors, capacitors, and inductors in applications requiring large value, highly accurate resistors, capacitors, and inductors without the cost associated with these large value components. One application is in the design of an extremely low pass filter. This extremely low pass filter comprises a filter capacitor of nominal capacitance, a filter resistor of nominal resistance, and the impedance multiplier circuit. Since the corner frequency of a low pass filter is determined by the inverse of the product of the resistance and capacitance, the larger the resistor, the lower the corner frequency of the filter.
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Stephen R. Fleeman, Electronic Devices Discrete and Integrated, Prentice Hall, Inc. 1990, pp. 504-508 and pp. 841-846.
Makeever Jeffery J.
Sundstrand Corporation
Tran Toan
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